About Us
At Riverdale, we understand the frustration of high property taxes in Nassau County, New York. That's why we're here to help homeowners like you achieve fairness. We don't just guide you – we handle the entire property tax grievance process, from start to finish.
Let our experts navigate the complexities, gather evidence, and fight for the tax reduction you deserve. You pay only your fair share, while we ensure a smooth and successful experience.
2023: Volunteering our time to keep our community beautiful.
Our Leadership Team
Sean Leo
Founder & Head of Analytics
Guy Seminerio
Head of Operations
An engineer by background, Sean brings over 15 years of analytical expertise to Riverdale. He honed his skills in the industry before earning his MBA in Finance & Business Analytics from NYU Stern. Now, Sean leverages this data-driven approach to provide clients with in-depth market research. This research forms the foundation for compelling cases that get you the property tax reduction you deserve. When he's not advocating for your fair share, Sean enjoys training Brazilian Jiu-Jitsu, honing the focus and dedication that fuel his success – skills he hopes his two daughters will someday inherit.
A U.S. Army veteran, Guy served his country with distinction in logistics. After his service, he transitioned his leadership skills to the private sector, managing operations for major companies. Guy now brings his experience and approachable personality to Riverdale as our Head of Operations. He's a dedicated father of two and a passionate Rangers fan, known for his enthusiasm and drive to get results.
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Rashid Powell
Head of Marketing
Jennifer Tsang
Head of People
Rashid brings a wealth of marketing expertise to Riverdale. In his previous role, he spearheaded the growth of a social media brand, building a community of over half a million members across international markets (3M monthly reach). His experience extends beyond social media, having led multinational teams in crafting compelling content and fostering engagement across diverse audiences. This, combined with his branded clothing sales & marketing background, demonstrates a strong understanding of building and promoting brands. When not strategizing, he enjoys wrestling and travel.
With a strong engineering background and a passion for building strong teams, Jennifer brings a unique perspective to Riverdale. Her diverse experience across fields and locations, combined with her natural ability to connect with people, makes her the perfect fit as our Head of People. She fosters a collaborative and inclusive environment, ensuring our team delivers exceptional service to every client. A dedicated mother of two, Jennifer understands the importance of balance. When she's not building a strong team at Riverdale, she enjoys yoga – a practice that reflects her dedication to well-being.